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Characteristics of the Initial Breakdown Pulses in Negative Cloud-to-Ground Flashes Occurred in the Central Region of Colombia
Palabras clave:
cloud-to-ground lightning flashes, electric field, first return stroke, negative flashes, preliminary breakdown pulses (en)Descargas
In this work, the electric field signatures of the initial preliminary breakdown pulses (PBP) identified in 69 negative cloud-to-ground (CG) flashes recorded in Colombia are characterized. The measuring system was in the Bogotá savannah, which is a mountainous region located in the southwestern part of the Altiplano Cundiboyacense in the center of Colombia (altitude of 2550 m). The measurements were conducted using a broadband system (up to 50 MHz), with a full observation window of 500 ms and a 250 ms pre-trigger time. For the analysis of the most relevant features of the PBP waveforms several parameters were selected: pulse train duration, time interval between the largest peak of the PBP train and the FRS (PBP-FRS), ratio of higher peak amplitude of PBP to the first return stroke, interpulse time (IPT), number of individual pulses in each PBP train and individual pulse duration. The results obtained show that PBP-FRS and has an arithmetic mean (AM) of 5.4 ms and 0.47, respectively. The PBP-FRS presented values between 0.7 ms and 298.6 ms. On the other hand, the temporal parameter has a geometric mean (GM) of 1.46 ms, with a maximum value of 5.2 ms and a minimum of 0.5 ms. With respect to the IPT, it presents an AM of 125.68 µs and GM of 74.28 µs. In addition, other statistical results are shown.
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Derechos de autor 2023 Simposio Internacional sobre la Calidad de la Energía Eléctrica - SICEL
Esta obra está bajo una licencia internacional Creative Commons Atribución 4.0.
